Datasheet

AD9920A
Rev. B | Page 28 of 112
PHASE 1
PHASE 3
PHASE 2
H1/H2
H5/H6
H7/H8
MASK LEVEL = HIGH
MASK LEVEL = HIGH
MASK LEVEL = LOW
BLANKING
A3
A2
A
B
B3
B2
B1
A1
1 PIXEL 1 PIXEL1 PIXEL1 PIXEL1 PIXEL
06878-033
INTERNAL
DIGITAL
CLOCK
MASTER
BLANKING
SIGNAL
Figure 34. Incorrect HBLK Behavior Caused by Internal Clock Position
PHASE 1
PHASE 3
PHASE 2
INTERNAL
DIGITAL
CLOCK
MASTER
BLANKING
SIGNAL
H1/H2
H5/H6
H7/H8
1 PIXEL 1 PIXEL1 PIXEL1 PIXEL1 PIXEL
A3
A2
A1
A
B
B3
B2
B1
FINE RETIME
FINE RETIME
FINE RETIME
FINE RETIME
MASK LEVEL = HIGH
MASK LEVEL = HIGH
MASK LEVEL = LOW
BLANKING
0
6878-034
Figure 35. Fine Retime on Phase 2 to Achieve Correct HBLK